CNG & LNG
Two Proven Fuel Pathways
130 Octane Rating
High-Performance Combustion
Up to 30% Less NOx
vs. Conventional Diesel
25% of U.S. Energy
Domestically Produced & Delivered
The Fuel
What Is Natural Gas?
Natural gas is a domestically produced alternative fuel delivered directly to end-users through the existing utility pipeline infrastructure -- no new supply chain required.
It is a mixture of hydrocarbons, predominantly methane (CH4), along with ethane, propane, nitrogen, helium, carbon dioxide, hydrogen sulfide, and water vapor as delivered through the pipeline system.
Natural gas is non-toxic, non-corrosive, and non-carcinogenic. It presents no threat to soil, surface water, or groundwater -- making it one of the safest alternative fuels available for fleet operations.
Both compressed natural gas (CNG) and liquefied natural gas (LNG) are designated alternative fuels under the Energy Policy Act of 1992, with horsepower, acceleration, and cruise speeds comparable to conventional vehicles.
Safe & Non-Toxic
Non-corrosive and non-carcinogenic, natural gas poses no risk to soil, surface water, or groundwater -- a major advantage over petroleum-based fuels.
High Octane Performance
With a 130 octane rating, natural gas delivers excellent combustion properties for spark-ignited engines -- matching conventional vehicle performance without the emissions penalty.
Fewer Harmful Emissions
Natural gas vehicles produce significantly less NOx, particulate matter, and greenhouse gas emissions compared to gasoline and conventional diesel engines.
Existing Pipeline Infrastructure
Natural gas reaches fleets through the same utility pipeline network already serving homes and businesses across Indiana -- no new supply infrastructure needed to get started.
Domestic Energy Security
Natural gas accounts for roughly a quarter of all U.S. energy use. Tapping it for transportation reduces dependence on foreign oil and keeps energy spending inside the country.
Fuel Formats
CNG vs LNG -- What Is the Difference?
Natural gas is available in two primary forms for transportation. The right choice depends on your fleet size, route length, and fueling infrastructure.
Compressed Natural Gas (CNG)
CNG is natural gas compressed to less than 1 percent of its volume at standard atmospheric pressure, stored in high-pressure cylinders onboard the vehicle.
CNG is the most common natural gas vehicle fuel in the U.S. and is best suited for light- and medium-duty fleets with centralized fueling -- buses, delivery vehicles, and municipal fleets.
Best for light- and medium-duty fleets
Works with centralized depot fueling
Widely available at public fueling stations
Liquefied Natural Gas (LNG)
LNG is natural gas cooled to -260 degrees Fahrenheit until it becomes a liquid. In liquid form it is 600 times denser than gas, storing far more energy in the same tank space.
LNG is ideal for long-haul, heavy-duty applications where the energy density advantage over CNG makes a meaningful difference in range -- particularly for Class 8 trucks and freight fleets.
Best for long-haul and heavy-duty fleets
Higher energy density than CNG per tank
Used widely in Class 8 freight trucking
Vehicle Options
Three Types of Natural Gas Vehicles
Natural gas vehicles come in three configurations -- each suited to different fleet needs and duty cycles.
Dedicated
Designed to run exclusively on natural gas. Dedicated vehicles offer the best emissions performance and are optimized for maximum fuel efficiency on a single fuel type.
Best for: High-mileage fleets with reliable CNG fueling access
Bi-Fuel
Can run on either natural gas or gasoline, switching between the two as needed. Bi-fuel vehicles give fleets flexibility during the transition to natural gas fueling infrastructure.
Best for: Fleets transitioning to CNG with limited fueling coverage
Dual-Fuel
Uses diesel fuel for ignition assistance alongside natural gas combustion. Dual-fuel systems are generally limited to heavy-duty vehicles and offer a practical path for large fleets.
Best for: Heavy-duty trucks and large commercial fleet applications
Industry Resource
America's Natural Gas Alliance
The America's Natural Gas Alliance (ANGA) represents North America's leading independent natural gas exploration and production companies.
ANGA works with industry, government, and customer stakeholders to promote increased demand for and continued availability of the nation's natural gas resources.
The goal is a cleaner, more secure energy future powered by abundant domestic natural gas -- reducing dependence on foreign oil while improving air quality nationwide.
Industry Resource
American Gas Association
Founded in 1918, the American Gas Association (AGA) represents more than 200 local energy companies that deliver clean natural gas throughout the United States.
More than 68 million residential, commercial, and industrial customers across the nation receive reliable, affordable natural gas from AGA member companies.
Natural gas meets almost a quarter of all U.S. energy needs -- and AGA members are the backbone of the infrastructure that makes that possible every single day.
